function toYellow() {
    let yellow = document.getElementById("yellow");
    if (yellow.style.color == "yellow") {
        yellow.style.color = "black";
        document.body.style.backgroundColor = "#ccff66";
    } else {
        yellow.style.color = "yellow";
        document.body.style.backgroundColor = "#66ccff";
    }

}

document.querySelector(".input").style.